Inductive light source



455-600 M) 233 EX FIPBlO XR 1,785,070

I Dec. 16, 1930. T. w. CASE 1,785,070

INDUCTIVE LIGHT SOURCE Filed July 23. 1928 fzoVolis 60Cgc les High Frequency fludwn Oscillailllg Sysiem i VENTOR Patented Dec. 16, 1930 UNITED STATES PATENT OFFICE THEODORE WILLARD CASE-OI AUBURN, NEW YORK, ASBIGNOB '10 CASE RESEARCH LABORATORY INCORPORATED, OF AUBURN, NEW YORK, A CORPORATION OF NEW YORK ' INDUOTIVE LIGHT SOURCE Application fled am as, 1028. Serial in. 894,887.

This invention relates to a certain new and useful inductive light source.

The main object of the invention is to produce a novel, attractive and intense source 6 of light which may be maintained at an effective constant intensity or varied in accordance with sound waves for television, light telephony, light signaling, etc.

Other objects and advantages relate to the details of the device and the relation of the parts thereof, all as will more fully appear from the following description taken in connection with the accompanying drawings, in which Figure 1 diagrammatically illustrates an embodiment of the invention. Figure 2 diagrammatically illustrates a further embodiment of the invention.

Figure 3 diagrammatically illustrates a method of determining the desired gas pressure withinthe bulb of the light source.

As illustrated in Figure 1, the structure com rises a bulb or container -1- formed of g ass or other suitable transparent mate- .5 rial, altho it would not be essential that the entire wall of the container should be transparent, yet suflicient of the wall should be transparent in order to permit the passage of light rays as desired. This bulb may be of any suitable form, but is shown in the form of a cylinder. However, a sphere or other form would'be satisfactory.

The induction coil -2 may, as shown, he wound about or disposed around the bulb provided, if desired. The leads from the -1-'- and its terminals may be connected P condensers are connected to the terminals of the induction coil 2.

It is found that when bulb 1- is filled with an inert gas such as helium, argon, neon, nitrogen, etc., that the passage of a high frequency oscillating current through coil 2 will cause the gas to glow, producing an intense light source. The source of light thus roduced may be utilized for any purpose desired, and in Figure 2 there is illustrated a means for varying the produced light in accordance with sound waves. In this case the terminals of the coil -2 are connected to the output of a high frequency audion oscillating system, the structure and arrangement of the parts of which is well known. i

The input of this big}:9 frquency audion oscillati-ng system may connected to a microphone -9- by means of which current flowing in the circuit is modulated in accordance with sound waves, with the result that the light waves emanating from the bulb -1 will vary in accordance with the variations of the electrical circuit to which coil -2- is connected, as efiected in accordance with sound wave variations.

' In order toempirically determine the desired pressure of gas for various cases and for various conditions of operation and sizes of devices, I have illustrated in Figure 3 two bulbs --11 and 12- of similar form, size and sha -The bulb -11- contains no electrodes, but in the bulb -12- there are laced two spacedelectrodes 13- and --14 which may be connected to either of the high uency circuits described.

= The gas etc 15 and -16 of the bulbs -11 and -12 respectively may be connected by conduit --17 to a source of as supply under ressure. The gas is alowed to enter bot bulbs from thisgingle source until such at'nne as a glow takes place in the bulb -12- between the electrodes --13- and -1 1-. When the desired character of glow has been reached, the bulb 11 is sealed off the inlet -15- and is then in condition foruse in accordance with the disclosure of Figures 1 and 2.

' .Altho I haveshown and described specific v structures as' constituting embodiments of v the invention, I do not desire to restrict myself to any means of producing high frequency oscillating current .for supply to the in- 5 duction coil or to any means or modulating current flowing in such circuit, as various changes and modifications may be made within the scope of the appended claims.

I claim:

1. A source of light comprising a bulb having awall permittin the passage of light rays, a gas within the ulb, a coil adjacent the bulb, means for producing high frequency oscillating currents in the coil, and means for modulating said current in accordance with sound wave variations.

2. A source of light comprising a bulb having a wall permitting the passage of light rays, an inert gas within the bulb, a

coil around the bulb, an audion oscillating system connected to said coil for producin high frequency currents in said, coil an means for modulating said current in accordance with sound wavevariations.

5 In witness whereof I have hereunto set my hand this 20th day of July 1928.

THEODORE WILLARD CASE. 

